Circular knitting machine



March 29, 1938. c. F. MANGER ET AL 2,112,501

CIRCULAR KNITTING MACHINE Filed April 12, 1937 3 Sheets-Sheet l March29, 1938;

c. F. MANGER ET AL 01 CIRCULAR KNITTING MACHINE Filed April 12, 1957 3Sheets-Sheet 2 Q a 41:3? MIf-4 v C- *4 43 FMMWW M m March 29, 1938. c.F. MANGER ET AL CIRCULAR KNITTING MACHINE Filed April 12, 1937' 3Sheets-Sheet 3 Patented Mar. 29, 1938 UNITED STATES PATENT OFFICECIRCULAR KNITTING MACHINE company Application April 12, 1937, Serial No.136,440 In Great Britain April 20, 1936 Claims.

This invention is for improvements in or relating to circular knittingmachines and is concerned more particularly with yarn-changing mechanismwith which said machines are commonly provided.

An object of the present invention is to provide a circular knittingmachine having yarn-changing mechanism comprising a plurality ofinterchangeable yarn feeders, for instance mechanism of the kinddescribed in the specification of U. S. Letters Patent No. 1,838,651 orBritish Patent No. 408,598, with an additional yarn feeder andassociated yarn cutting and trapping device for enabling the machine toperform what is known as half-round splicing. In half-round splicing, asplicing or reinforcing yarn is fed only to a section of the needles inthe needle circle and these needles (in number usually about half thetotal number of needles) knit the splicing yarn together with a mainyarn into the portion or portions of the knitted tubewhich is or are tobe spliced or reinforced.

In half-round splicing, the half-round,splicing yarn extends from oneside of the knitted tube, around the back, to the other side of thetube, while in yarn-changing, as for instance in striped work, the yarnchange is made at the back of the tube. The feeder for the half-roundsplicing yarn and the feeders for the main yarns have therefore to moveinto and from feeding position at difierent parts of the knitted tubeconsidered circumferentially of that tube. With a view to simplifyingthe operation of the machine, the present invention contemplates are-arrangement of the timing of the several feeders, the feederseffecting the yarn'change being timed to move respectively into and outof feeding position at approximately the same time as the feeder for thehalf-round splicing yarn moves into or out of feeding position at thebeginning or end respectively of the half-round spliced portion of thework. In the preferred arrangement the yarn change occurs at the back ofthe tube as usual, and the half-round splicing begins and ends at thesame point, the timing of the movements of the, feeder for thehalf-round splicing yarn at the beginning and end of the spliced portionbeing correspondingly altered. As the feeder for the half-round splicingyarn will accordingly move into and from feeding position at differenttimes during the knitting of the spliced portion, it is convenient toprovide two separate operating mechanisms for the feeder each of whichmechanisms actuates the feeder at the appropriate time. In the preferredarrangement, the feeder for the half-round splicing yarn is operated atthe time of yarn change by connections from the mechanism which actuatesthe yarn feeders that produce such change.

A feature of the present invention is the provision in a circularknitting machine, .of yarnchanging mechanism comprising in combination aset of interchangeable main-yarn feeders any two of which are movable,respectively, into and from feeding position to effect a change in themain yarn supplied to the needles, an additional yarn feeder alsomovable into and from feeding position to supply to a group ofthe'needles a splicing yarn to be knitted with a main yarn into thefabric for only part of each course of a portion of the fabric, andoperating mechanism for the yarn feeders arranged to. move said feedersin such timed relationship that the initial and final part-coursescontaining the splicing yarn begin and end, respectively, substantiallyat a needle-position in the needle circle at which position a change ismade in .the main yarn.

Other features of the invention relate to mechanism for operating theyarn cutting and trap ping device for the half-round splicing yarnwhereby the said device is operated in timed relation with the feederfor that yarn;- to means comprising a catch device which, at times,holds the trapping device open and is adapted to be tripped to permitthe trapping device to close upon the half-round splicing yarn as thefeeder for that yarn moves into its non-feeding position; and to meansfor positively maintaining the half-round splicing mechanism entirelyout of action when half-round splicing is not required.

A convenient construction of mechanism embodying the above and otherfeatures of the present invention, which are all pointed out in theappended claims, will now be described with the aid of the accompanyingdrawings and will be considered as applied to a circular knittingmachine having yarn-changing mechanism of the kind described in thespecifications of U. S. Letters Patent No. 1,838,651 and British PatentNo. 408,598.

In the accompanying drawings:-

Figure 1 is a plan of yarn-feeding and associated mechanisms of saidconvenient construction;

Figure 2 is a front elevation of the mechanisms shown in Figure 1; and

Figure 3 is a side elevation of the same.

In the said convenient construction, the yarn feeder 3| (Figure 1)whichhas been added to the machine for the half-round splicing yarn isin the form of a somewhat L-shaped rod, similar to the feeder 130 or 132of British Patent No. 408,598. This rod is arranged to slide in the endwalls of a frame member 33 which is mounted somewhat behind and belowthe corresponding member (138 of said specification) for the saidfeeders I33, I32 and is carried upon the same post I44 as said member.Attached to the shank of the added feeder is a horizontally disposedblock 33 (similar to the vertically disposed block 155 of saidspecification) in which block there is a screw 31 which is guided by aslot 33 (Figure 2) in a plate attached to the side of the frame member33. The feeder 3| is moved into its feeding position by a spring 43 andaway from that position by a vertically disposed lever 45 which carriesat its upper -end an adjusting screw 41 the point of which bears againsta depending portion 49 of the block as on the shank of the feeder 3|,which portion 43 projects through a slot 5| (Figure l) in the framemember 33. It is found convenient to mount this adjusting screw 41 in apin 33 (Figure 1) which itself is adjustable along a slot 35 extendinglengthwise of a bent-over horizontalmachine approximately'the sameposition as that occupied by the device 146 in the earlier machine, thedevice I46 in the present machine being located (as shown in Figure 1)immediately ad-' iacent the said trapper 59 onv the side of that trapperthe more remote from the feed point.

In half-round splicing the yarn is fed to about half the needles of theneedle circle. At the beginning of each half course of the half-roundsplicing the yarn extending from the trapper 59 to the feeder 3|, whichis now in its feeding position, is taken by the needles and the yarnendis released by the trapper, and at the end of each said half course, thetrapper cuts and traps the yarn as the feeder moves (to the right inFigure l) to its non-feeding position in which it is shown in Figure 1.

In the knitting of a striped sock or the like, the change from one yarnto another occurs at the back of the knitted tube, that is to say on aline which, considered lengthwise of the tube, is about midway betweenthe beginning and end of each half course of the half-round splicing.This change may occur at a time in which the halfround splicing feederis in feeding position, and

in order that the movements of the other feeders toward and from feedingposition shall not be obstructed by the splicing feeder, the paths ofmovement of these other feeders have been modified. To this end, in thepresent machine, the feeders 130, 132 of British Patent No. 408,598 (theapproximate yarn-feeding positions of which are indicated in brokenlines in Figure 1) are arranged to dip under the half-round splicingfeeder 31 and the feeders (of which one is similarly shown in Figure 1but in non-feeding position) of said specification are arranged to liftoverthe said splicing feeder. Any convenient means may be provided forgiving to the feeders I3, I30, I32 the required paths of movement, for

' instance the slots 124, 158, 159 of said specification, may beappropriately shaped.

When the said feeders I 30, I32 move to their non-feeding positionadjacent their associated yarn cutting and trapping device I46,- it isnecess'ary that the trapper 33 for the half-round splicing yarn beclosed since the yarns from the feeders I30, I32 have to pass by it. Themechanism, which'is described hereinafter, for operating the trapper 58is accordingly arranged to close the trapper at this time, as well as togive to the trapper its normal opening and closing movements. "Thetrapper it accordingly opens to release the yarn at the beginning ofeach half course of the half-round splicing, next closes to 'allow theyarns from the feeders I30, I32 safely to pass by it, then opens againin readiness to before the knitting of the heel is started, and

when the knitting of the heel is to start, the knitting of thehalf-round splicing yarn is stopped and the main yarn is changed to aheavier yarn, or a yarn having a splicing yarn running with it, for theheel. Change of yarn takes place, as already mentioned, at the back ofthe sock or the like, and as the half-round splicing extends from oneside of the sock to the other, the course containing the yarn-changewill be composed, either partly of the heel yarn or yarns and thehalf-round splicing yarn, or partly of the leg yarn only (without thehalf-round splicing yarn) according, to whether the half-round splicingyarn is introduced into the course containing the yarn change or whetherthe knitting of the halfround splicing yarn is stopped at the precedingcourse. A similar effect occurs at the end of the knitting of the heelwhen the yarn is changed from the heel yarn to the leg yarn and also atthe beginning of the knitting of the toe. Such results are not desirableand are avoided in the present machine by providing mechanism (later tobe described herein) which operates the halfround splicing feeder 3| andtrapper 59 so as to withdraw the half-round splicing yarn from theneedles at the same time as'the heel yarn is introduced, at thebeginning of the knitting of the heel and of the toe, and to introducethe halfround splicing yarn to the needles at the same time as the heelyarn is withdrawn at the end of the knitting of the heel. As thehalf-round splicing yarn has to be withdrawn at the same time as theyarn change takes place at the beginning of the knitting of the heel andof the toe, and to be introduced also at the same time as the yarnchange takes place at the end of the knitting of the heel, it isconvenient to operate the half-round splicing feeder 3| at these timesfrom the yarn-changing mechanism which con trols the operation of thesaid feeders I ll, I30, I32. This has the additional advantage that therelationship between the yarn change and the introduction or withdrawalof the half-round splicing yarn will remain constant whatever theposition of the yarn change, which position is subject to adjustment.

As the half-round splicing feeder 3I has to move to its inoperativeposition and the trapper 59 has to close at one time during normalhalfround splicing and at another time at the beginning of the knittingof the heel, it is economical in cams and convenient in setting up themachine to control the closing of the trapper 59 from the feeder 3|itself. The trapper is preferably opened (against the action of itsclosing spring) from cams on arunning shaft 6| (Figure 3) of the machineand at times is held open by a catch (hereinafter described) which isreleased to permit the trapper to be closed by its spring, as the feeder3| reaches the trapping position. Three different cams operativelyconnected with the trapper at different times during the knittingdof anarticle are required to open the trapper, viz: a cam 63 for normalhalf-round splicing, a cam 55 for use at the beginning of the knittingof the heel and with any one of these cams.

lever is constituted by a horizontally disposed of the toe, and a cam 91for use at the end of the knitting of the heel. lifts, the first liftopens the trapper 59 sumciently to release the yarn at the beginningofeach half course of the half-round splicing, but

not sufiiclently to allow the catch to operate; the trapper immediatelycloses again and the second lift opens the trapper after the yarns fromthe feeders I39, E32 have passed the trapper, the trapper being openedto such an extent that the catch retains it in the open position. Thecam 65 has only one lift which occupies the same angular position on thesaid running shaft as the first lift of the cam 63 but is high enough toallow the catch to operate. The cam 63 could not be used at thebeginning of the knitting of the heel and of the toebecause thehalfround splicing ieeder' 3i (operated from the said yarn changingmechanism at this time) moves to its trapper 59 just ahead of thefeeders I39, I32 and the trapper closes to cut and trap the yarn justbefore the yarns from the feeders I39, 632 pass it. The secorid lift ofthe cam 63 operates later thanthis and would therefore release the yarnagain from the trapper. The cam 51 also has only one lift which is highenough to allow the catch to operate, but its time of operation isarranged to suit the introduction of the half-round splicing yarn at thesame time as the yarn change.

Mechanism for operating the feeder 3i for the half-round splicing yarn,the trapper 59 associated therewith, and other parts of the machine willnow be described. I I

The, vertically disposed lever t5 which, as aforesaid; is employed tomove the half-round splicing feeder 38 away from its feeding position,is operated by a cam 59 (Figure 2) on a rotating shaft I69 of themachine, the cam 59 being formed in separate parts relatively adjustablecircumferentially of the shaft I59 to enable the timing of the operationof the lever 45 to be varied.

The three cams 65, 6?, 69 (Figure 3) for opening the trapper 59aredisposedside by side on the said running shaft GI and co-operate witha lever II which can be swung laterally to bring its cam-engaging endinto operative relation The pivot of the pin 73 fixed in a block I5carried by a vertically disposed pin .17 mounted to turn freely in abracket I9 secured to the main frame of the machine. The lever II isswung laterally about the axis of the pin I1 and against the action of aspring 8i (Figure 1) by cam pieces 83, 85 (Figure 2) carried upon a part81 which revolves with the main control drum -9f the machine. These campieces 83, 95 act upon one end of an elbow lever 89 the other end ofwhich'is connected by a link M with an-arm 93 secured to The cam 63has'two the pin 11. The connections between the trapper 59 and thelever, comprise avertically disposed tappet 95 the lower end of which isengaged by a stud 91 on the lever and the upper end of which is engagedby an adjusting screw 99 on a second lever IOI (Figure 3) which at oneend is pivoted at I93 upon the bracket 19 and at its other (free) endengages an adjusting screw I05 on an elbow leveii IO'I which actuatesthe trapper 59. This elbow lever I01 corresponds with the elbow lever180 of British Patent No. 408,598 but is inverted as compared with thatlever so that an upward movement of the screw-carrying arm of the leverI91 under action of one of the trapper cams through the connectionsdescribed, causes the trapper 59 to open.

Provision is made for maintaining the halfround splicing mechanismentirely out of action during the knitting of certain parts of the sockor, the like as'willhereinafter appear. To this end the verticallydisposed pin Ti has a second arm I 99 (Figure 1) secured to it, uponwhich arm there is formeda cam surface III (Figure 3) adapted to engagean adjusting screw I I3 on one end of a small spring pressed stop leverH5. The other end of this small lever H5, when the lever is moved bysaid cam surface I i i, is adapted to engage an adjusting screw i i!carried in a part M9 secured to the vertically disposed lever 55 thatoperates the half-round splicing feeder 3 i and thereby preventsmovement of that lever.

The machine has mechanism for adjusting the "stitch cam. This mechanismcomprises a pair of stitch-slackening cams IEI, I23 (Figure 3) mountedon the running shaft GI adjacent .the trapper-opening cams 63. 55, 51.Co-operatin with this pair ofcams I28, H3 is a lever I25 which ismounted upon the pin 73 which carries the lever 'H. The lever I 25 has astud I21 upon it which engages the lower end of a vertically disposedtappet I29, the upper end of which tappet is adapted to engage anadjusting screw I3I in an arm I33 secured tor-a rockshaft 635 carried inbearings on the bracket 19. The rockshaft l35 has a right-angled portionI37 (Figure l) which is connected by a link I39 -with a lever MI that.is coupled to the member which carries the stitch cam.

For convenience of construction and assembly the three trapper-openingcams 93, 55, 51 and the pair of stitchslacking cams IEI, .5231'316 alladjustably mounted on a. sleeve I93 (Figure 3) which is carried upon anddriven by the running shaft SI. 1

The means for operating the half-round splic ing feeder 3i from the saidyarn-changing mechanism at the beginning of the knitting of the heel andof the toe and at the end of the knitting of the heel comprise anadditional control unit consisting of a ratchet wheel I 45 (Figure 2)and a cam I41 for operating the feeder-lever 45, which ratchet wheelandcam are mounted on the shaft of U. S. Patent No. 19,838,651, and anadditional pawl I49 to engage the ratchet wheel I is mounted in thepawl-carrying frame 41 of the --said specification, the frame beingenlarged for The connections between the cam,

is coupled by a. link I51 to the lever 45. Forthej the link I51 and thelever 45, comprises a cylin ure 3)., which engages the adjustingscrew-I" on 'the elbow lever, ll of the trapper 59, when the lever Illlis raised to its fullest extent. When this occurs, the trapper is heldopen. The free end of the catch lever I81 extends upwardly (see 5 Figure2) close to the path of movement of an adjusting screw I'll which is'threadedin a pin I" carried in an ear III of the link I". Whentherefore the link I" is moved, to the right in Figure 2, to cause thelever 45 to return the feedso er ii to its non-feeding position, theadjusting screw I'Ii will engage the catch lever .I I! and that lever(if it be operative at that time) will be tripped to release the leverIN and thereby enable the trapper 59 to be closed by the action of itswring.

During the knitting of the welt, the rib top,

and the leg of a sock or the like, the half-round splicing mechanism isinactive since at this time the lever II that is actuated by the trappercams II, 65, 81 has been swung laterally out of range of those cams bythecam piece a (Figure 2) on the control drum acting through theconnections described, including the elbow lever 89, one end of whichrests upon this cam piece 83 at this time. The cam-engaging lever III ofthe stitch-slacking mechanism has also at this time and by the actionof-this cam piece 88 been swung out of range of the stitch-slackeningcams I2I, I23. And. the lever 4B of the feeder mechanism is held out ofaction by the parts including the arm I" (Figure 'l)' which under theinfluence of the cam piece 03 has been moved to cause its camsurlace IIIto actuate the stop lever H5. When'in'the knitting of the sock the pointis reached where the high splice is to begin a movement of the controldrum moves the said cam piece 8! from under the end' of the elbow lever89 allowing that end. to fall to its lowest position. This action causesthe trapper-cams lever I I- to be swung into range of the trapper cam,II, the slackening-cams lever III to be swung over the twostitch-slackening cams III, Ill-its cam-engaging'end being wide enoughto engage both of those cams-and the lever 45 of the'feeder mechanism tobe released by movment of the stop lever II. The three levers II, III,and ll are now operated .by their respective cams and half-roundsplicing is begtm and continues as long as is required for the articlebeing knitted. The stitch-slackening cams LIZ! cause the stitchcam-ofthe machineto be adjusted so that slightly longer loops in the knittingare drawn during the time that half-roun splicing is being knitted;

At the beginning of the knitting of the heel, another movement of'thecontrol drum brings the first and lowest step II! of the cam piece I!(which is a three-step cam piece) under the end of the elbow lever II!and thereby swings the trapper-cams lever II into range of-the cam 65and at the same timeswings theslackening-cams lever III laterally sothat it is within range of onb one (i. e. cam III) of the pair ofstitchslackening cams. At this time in the operations of the machine,the half-round splicing yarn is introduced into the knitted fabricexactly as in the previous courses but the trapper I9 owing to theactionof the trapper cam is opened to its widest extent and held open bythecatch lever I61. Approximately a quarter of arevolutionof the needle,cylinder after the half-round splicing yarn has been introduced theyarn-changing 'mechanism operates to introduce the heel yarn and towithdraw the leg yarn. At the sametime the additional pawl m for theadditional control unit is permitted to engage its ratchet wheel I4!ting the trapper to cut and trap the half-round splicing yarn. Thestitch-slackening cam I23 which is'in operation still maintains theprevious adjustment of the stitch eam but before the end of theslackening cam I23 comes underthe lev e'r I25, another movement of thecontrol drum has caused the stitchcam to be adjusted for the heel by theusual quality of ,the machine. A further movement of the control drumnext causes the second and highest step 2" of the three-step cam piece85 to come under the end of the elbow lever 89 whereby the trapper-camslever II and the slackening-cams lever III are moved to their idlepositions out of range of their cams and the cam-surfaced arm III! ismoved to.

The turning of the additional control unit cause the stop lever III tohold the feeder lever I 45 out of action. The half-round splicingmechanism thus ceases itsoperation and remains inactive during theknitting of the heel.

At the completion of the knitting of the heel the control drum movesagain to permit the end of the elbow lever 89 to fall upon the thirdstep 385 of the three-step cam piece 85 whichstep in height isintermediate between the highest and lowest steps I", 285. This movementof the control drum brings the trapper-cams lever II. into range of thetrapper cam 61 but the consequential lateral movement that is impartedto'the slackening-cams lever I2! is not suflicient to bring that leverinto range of itscams I ll, I23.

At the same'time the cam-surfaced arm I is moved to bring about releaseof the feeder lever 45, but this lever is not free to be actuated by thecm I. on the rotating shaft I" since -it is under control of the cam Illof the additional control unit. As the yarn-changing mechanism operatesto substitute the foot yarn for the heel yarn, the pawl I relating'tothe additionalcontrol unit turns that unit thereby,ca'using the camI" of the unit to permit movement of the feeder lever 45 undr action ofthe spring 43 that acts upon the half-round splicing feeder II to allowthat feeder to move to feeding position as the. heel yarn is withdrawnfrom the needles. The trapper cam 61 also operates to cause the trapperto open at the appropriate time.- At this stage of the operations of themachine the usual quality cams maintain the loops at thetlength requiredfor the heel as this loop length serves also for the loops of thehalf-round spliced part. Hence operation by the stitch-slackening cams'I2l, I23 is not required.'

A further movement of the control drum takes the three-step cam piece I!from under the end of the elbow lever ll allowing that lever to fall -toits lowest position and thus permit the trapto move into range of itscams I2l, I23 which thereupon take over control of the loop-length fromthe quality cams whereby the loop-lengths are changed from the heelloop-length to the loop-length appropriate for the instep part of thesock. Normal half-round splicing then continues throughout the knittingof the foot portion of the sock.

At the beginning of the knitting of the toe of the sock the variousmovements of the machine parts which occurred at the beginning of theknitting of the heel are repeated.

In the knitting of an article that is not to be striped during thehalf-round splicing operation, the half-round splicing yarn may befloated, if desired, at the end of each half-round course instead ofbeing trapped and cut. This result can be obtained by adjusting theadjusting screw I13 so that it does not engage the catch lever I61 asthe feeder lever 45 is swung by the link I51 to non-feeding position andso that consequently the catch lever I6! is not tripped to release thetrapper 59.

We claim:

1. In a circular knitting machine having a plurality of interchangeablemain-yarn feeders and mechanism for moving one of said feeders out offeeding position and another of said feeders into feeding position toeffect a change in the main yarn .fed to the needles, a splicing-yarnfeeder movable into and from feeding position to feed to a group ofadjacent needles of the machine a splicing yarn to be knitted into themain-yarn fabric for only a part of each course of a portion of themain-yarn fabric, and operating means for the splicing-yarn feederarranged to move said feeder in such time relation with the movements ofthe main-yarn feeders that the initial and the final part-coursescontaining the splicing yarn begin and end, respectively, substantiallyat a needle-position in the needle circle of the machine at whichposition a change is made in the main yarn.

2. In a circular knitting machine having a plurality of interchangeablemain-yarn feeders and mechanism for moving one of said feeders out offeeding position and another of said feeders into feeding position toeffect a change in the main yarn fed to the needles, a splicing-yarnfeeder movable into and from feeding position to feed to a group ofadjacent needles a splicing yarn to be" knitted into the main-yarnfabric for only a part of each course of a portion of the main-yarnfabric, actuating means for the splicing-yarn feeder, and operativeconnections between the splicing-yarn feeder and the mechanism formoving the main-yarn feeders whereby the splicing-yam feeder is actuatedby saidmechanism when said mechanism'moves the mainyarn feeders toeffect a change in the main yarn.

3. In a circular knitting machine having a plurality of interchangeablemain-yarn feeders and mechanism for moving one of said feeders out offeeding position and another of said feeders into feeding position toeflect a change in the main yarn fed to the needles, a splicing-yarnfeeder,

actuating means for moving said splicing-yam feeder into and fromfeeding position, a yamtrapping device associated with the splicing-yamfeeder, and operating means for said yarn-trapping device arranged togive to said device an opening movement to release the splicing yarn,then a closing movement prior to the passage past the said device of ayarn from a main-yarn feeder, and finally, after the passage of saidyarn,

opening and closing movements to receive and trap the splicing yarn.

4. In a circular knitting machine having a plurality of interchangeablemain-yarn feeders and mechanism for moving one of said feeders out offeeding position and another of said feeders into feeding position toeffect a change in the main yarn fed to the needles, a splicing-yamfeeder, actuating means for moving said feeder into and from feedingposition, a spring operated yarntrapping device, a catch adapted tomaintain said device in open condition, operating means for saidyarn-trapping device comprising a cam having two lifts of differentheights, the lift of lesser height Opening the trapping device to anextent sumcient to release the splicing yarn but not suflicient topermit the catch to operate upon the trapping device, and the lift ofgreater height opening the trapping device to an extent such that thecatch can operate to maintain the said device open, and operativeconnections between the catch and the actuating means for thesplicing-yarn feeder, arranged to release the catch to permit closing ofthe trapping device when said splicing-yam feeder is moved intonon-feeding position.

5. In a circular knitting machine having a plurality of interchangeablemain-yarn feeders and mechanism for moving one of said feeders out offeeding position and another of said feeders into feeding position toeffect a change in the main yarn fed to the needles, a splicing-yamfeeder, actuating means for moving said splicing-yarn feeder into andfrom feeding position, a spring operated yarn-trapping device associatedwith the splicing-yarn feeder, a catch adapted to maintain theyarn-trapping device in open condition, means to trip said catch,operating means for the yarn-trapping device comprising three cams oneof which cams has two lifts of different heights, the lift of lesserheight opening the trapping device to an extent sufiicient to releasethe splicing yarn but not sufficient to permit the catch to operate uponthe trapping device and the lift of greater height opening the trappingdevice to an extent such that the catch can operate to maintain the saiddevice open, pattern mechanism, and operative connections between saidpattern mechanism and the operating means for the yam-trapping devicearranged to render the said cams operative but each at a predeterminedtime in the knitting operation which time is different from the times ofoperation of the other twd cams.

CHARLES FREDERICK MANGER. CARLYLE HERBERT WAINWRIGHT. GEORGE ALFREDBUSWEIL.

